Clean up some Vale substitution warnings

doc/administration/geo/replication/datatypes.md

doc/administration/geo/replication/object_storage.md

doc/administration/geo/replication/security_review.md

doc/administration/gitaly/praefect.md

doc/administration/index.md

doc/administration/nfs.md

doc/administration/object_storage.md

doc/administration/operations/filesystem_benchmarking.md

doc/administration/operations/index.md

doc/administration/pages/index.md

doc/administration/troubleshooting/linux_cheat_sheet.md

doc/api/group_wikis.md

doc/api/wikis.md

doc/ci/docker/using_docker_build.md

doc/development/code_review.md

doc/development/contributing/merge_request_workflow.md

doc/development/foreign_keys.md

doc/development/secure_coding_guidelines.md

doc/development/shared_files.md

doc/development/shell_commands.md